<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>test3</title>
</head>
<body>
	<script>
		console.log("a");
		setTimeout(function(){
			console.log("c")
		},500);
		setTimeout(function(){
			console.log("d")
		},1000);
		setTimeout(function(){
			console.log("e")
		},500);
		console.log("b");
	</script>
</body>
</html>